Re: Tuning Cassandra

Hi David If I may ask...how do you plan to import data from oracle to cassandra ? As answer AFAIK cassandra's true ability comes into play when running on more than one machine...and please share how you are making comparisons like on writes or reads from cassandra.

Re: Tuning Cassandra

t's > really frustrating my development effort that Cassandra is so slow. Can't I > get it up to twice as slow as Oracle in my configuration? > > On Mon, May 10, 2010 at 10:47 AM, vd wrote: > >> Hi David >> >> If I may ask...how do you plan to import data

Re: Tuning Cassandra

anything? > > On Mon, May 10, 2010 at 11:15 AM, vd wrote: > >> >> Hi >> >> what is it that you are using to connect with cassnadra TSocket or the >> buffered one ? >> >> >> >> >> ___

Re: How to write WHERE .. LIKE query ?

Hi Mike AFAIK cassandra queries only on keys and not on column names, please verify. On Tue, May 11, 2010 at 11:06 AM, Mike Malone wrote: > > > On Mon, May 10, 2010 at 9:00 PM, Shuge Lee wrote: >> >> Hi all: >> How to write WHERE ... LIKE query ? >> For examples(described in Python): >> Schem

how to count the columns

Hi Can we count the total no. of columns in a ColumnFamily, if yes how ?

updating column names

Hi I have a column named colom. Can we update column name "colom" to "column" during runtime or via API ?

Re: Is SuperColumn necessary?

Hi Can we make range search on ID:ID format as this would be treated as single ID by API or can it bifurcate on ':' . If now then how do can we ignore usage of supercolumns where we need to associate 'n' number of rows to a single ID. Like CatID1-> articleID1 CatID1-> articleID

what is DCQUORUM

Hi I have read about QUORUM but lately came across DCQUORUM. What is it and whats the difference between the two ?

Re: what is DCQUORUM

tle > discussion. > > Also see > http://svn.apache.org/repos/asf/cassandra/trunk/src/java/org/apache/cassandra/locator/DatacenterShardStrategy.java > and > > http://svn.apache.org/repos/asf/cassandra/trunk/src/java/org/apache/cassandra/service/DatacenterWriteResponseHandler.java > >

Re: searching keys of the form substring*

Hi Sagar You can use variable substitution. ___ Vineet Daniel ___ Let your email find you On Mon, May 31, 2010 at 3:44 PM, Sagar Agrawal wrote: > Hi folks, > > I want to fetch all those records from my column family

cluster throwing errors when new or existing node joins

(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) ERROR 18:46:51,310 Fatal exception in thread Thread[ROW-MUTATION-STAGE:6,5,main] Kindly suggest what can be the reason for this error. ___ VD ___ Let your

Re: searching keys of the form substring*

t I am not able to understand how can we use > variable substitution in it. > > > > > On Mon, May 31, 2010 at 4:42 PM, vd wrote: > >> Hi Sagar >> >> You can use variable substitution. >> ___ >> Vineet Daniel >

Re: Cassandra Write Performance, CPU usage

Hi Rishi The writes in Cassandra are not directly written to the Disk, they are stored in memory and later on flushed to the disk. May be thats why you are not getting much out of iostat. Cant say about high cpu usage. ___ Vineet Daniel _